#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int my_strlen(char* arr) {
	int i = 0;
	int len = 0;
	while (arr[i] != '\0') {
		i++;
		len++;
	}
	return len;
}
int main() {
	char arr[] = "hello bit";
	int ret = my_strlen(arr);
	printf("%d", ret);
	return 0;
}